S
M
T
W
T
F
S
26
76°
57°
27
78°
60°
28
78°
62°
29
81°
62°
30
82°
61°
31
82°
61°
1
81°
60°
2
78°
59°
3
76°
61°
4
79°
61°
5
76°
60°
6
76°
61°
7
81°
58°
8
77°
56°
9
76°
61°
10
79°
60°
11
78°
59°
12
80°
54°
13
76°
55°
14
76°
61°
15
80°
62°
16
83°
58°
17
80°
58°
18
82°
57°
19
79°
54°
20
76°
55°
21
76°
55°
22
77°
59°
23
80°
61°
24
81°
59°
25
81°
60°
26
80°
58°
27
75°
53°
28
75°
56°
29
77°
58°
30
82°
61°
31
83°
61°
1
83°
60°
2
82°
59°
3
82°
61°
4
81°
59°
5
82°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Sebastian
San Sebastian's August 2026 forecast shows daily high temperatures ranging from 75° to 83°, with overnight lows between 53° and 62°. The average high for August is 79° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in San Sebastian. See also: September | October | November.
